# mypy: ignore-errors

import collections
import contextlib
import enum
import functools
import inspect
import itertools
import random
import sys
import threading
import types
import warnings

from typing import Dict, Generic, List

from ..bytecode_transformation import create_call_function

try:
    import numpy as np
except ModuleNotFoundError:
    np = None

try:
    from torch.utils._cxx_pytree import PyTreeSpec
except ImportError:
    PyTreeSpec = type(None)

import torch._dynamo.config

import torch.nn
from torch._guards import TracingContext

from .. import variables
from ..create_parameter_op import do_not_convert_to_tracable_parameter
from ..exc import ObservedException, unimplemented
from ..guards import GuardBuilder, install_guard
from ..source import (
    AttrSource,
    GetItemSource,
    ODictGetItemSource,
    RandomValueSource,
    WeakRefCallSource,
)
from ..utils import (
    build_checkpoint_variable,
    check_constant_args,
    get_custom_getattr,
    has_torch_function,
    is_namedtuple_cls,
    is_utils_checkpoint,
    is_wrapper_or_member_descriptor,
    istype,
    namedtuple_fields,
    object_has_getattribute,
    proxy_args_kwargs,
    tensortype_to_dtype,
    unpatched_nn_module_getattr,
)
from .base import MutableLocal, VariableTracker
from .ctx_manager import GenericContextWrappingVariable, NullContextVariable
from .dicts import DefaultDictVariable


def is_standard_setattr(val):
    return val in (object.__setattr__,)


class UserDefinedVariable(VariableTracker):
    pass


class UserDefinedClassVariable(UserDefinedVariable):
    def __init__(self, value, **kwargs):
        super().__init__(**kwargs)
        self.value = value

    def as_python_constant(self):
        return self.value

    def python_type(self):
        return type(self.value)

    def as_proxy(self):
        return self.value

    def __str__(self):
        return f"UserDefinedClassVariable({self.value})"

    @staticmethod
    @functools.lru_cache(None)
    def _constant_fold_classes():
        return {
            torch.device,
            torch.finfo,
            torch.iinfo,
            torch.Size,
        }

    @staticmethod
    @functools.lru_cache(None)
    def _in_graph_classes():
        return set(tensortype_to_dtype.keys()) | {
            torch.Tensor,
            torch.cuda.Stream,
            torch.cuda.Event,
        }

    def can_constant_fold_through(self):
        return self.value in self._constant_fold_classes()

    def var_getattr(self, tx, name: str) -> "VariableTracker":
        from .. import trace_rules
        from . import ConstantVariable, EnumVariable
        from .builder import VariableBuilder

        if name == "__name__":
            return ConstantVariable.create(self.value.__name__)
        elif name == "__qualname__":
            return ConstantVariable.create(self.value.__qualname__)

        source = AttrSource(self.source, name) if self.source is not None else None
        try:
            obj = inspect.getattr_static(self.value, name)
        except AttributeError:
            obj = None

        if isinstance(obj, staticmethod):
            func = obj.__get__(self.value)
            if source is not None:
                return trace_rules.lookup(func).create_with_source(func, source=source)
            else:
                return trace_rules.lookup(func)(func)
        elif isinstance(obj, classmethod):
            return variables.UserMethodVariable(obj.__func__, self, source=source)
        elif source:
            # __mro__ is a member in < 3.12, an attribute in >= 3.12
            if inspect.ismemberdescriptor(obj) or (
                sys.version_info >= (3, 12) and name == "__mro__"
            ):
                return VariableBuilder(tx, source)(obj.__get__(self.value))

        # Special handling of collections.OrderedDict.fromkeys()
        # Wrap it as GetAttrVariable(collections.OrderedDict, "fromkeys") to make it consistent with
        # collections.defaultdict, and both will be handled at UserDefinedClassVariable.call_method().
        # Otherwise, it would be wrapped as UserDefinedObjectVariable(collections.OrderedDict.fromkeys),
        # and we need duplicate code to handle both cases.
        if self.value is collections.OrderedDict and name == "fromkeys":
            return super().var_getattr(tx, name)

        if ConstantVariable.is_literal(obj):
            return ConstantVariable.create(obj)
        elif isinstance(obj, enum.Enum):
            return EnumVariable(obj)
        elif name in getattr(self.value, "__dict__", {}) or (
            self.value.__module__.startswith("torch.")
            or self.value.__module__ == "torch"
        ):
            if source:
                return VariableBuilder(tx, source)(obj)

        return super().var_getattr(tx, name)

    def _call_cross_entropy_loss(self, tx, args, kwargs):
        """
        functional: input, target, weight=None, size_average=None, ignore_index=- 100, reduce=None, reduction='mean',
        label_smoothing=0.0

        non functional ctor: weight=None, size_average=None, ignore_index=- 100, reduce=None, reduction='mean',
        label_smoothing=0.0

        non functional loss call: input, target, optional_output
        """
        from . import ConstantVariable

        def normalize_args(
            weight=ConstantVariable.create(None),
            size_average=ConstantVariable.create(None),
            ignore_index=ConstantVariable.create(-100),
            reduce=ConstantVariable.create(None),
            reduction=ConstantVariable.create("mean"),
            label_smoothing=ConstantVariable.create(0.0),
        ):
            return (
                weight,
                size_average,
                ignore_index,
                reduce,
                reduction,
                label_smoothing,
            )

        (
            weight,
            size_average,
            ignore_index,
            reduce_arg,
            reduction,
            label_smoothing,
        ) = normalize_args(*args, **kwargs)

        def fake_cross_entropy_loss(input, target):
            from .builder import wrap_fx_proxy

            return wrap_fx_proxy(
                tx=tx,
                proxy=tx.output.create_proxy(
                    "call_function",
                    torch.nn.functional.cross_entropy,
                    *proxy_args_kwargs(
                        [
                            input,
                            target,
                            weight,
                            size_average,
                            ignore_index,
                            reduce_arg,
                            reduction,
                            label_smoothing,
                        ],
                        {},
                    ),
                ),
            )

        return variables.LambdaVariable(fake_cross_entropy_loss)

    def call_method(
        self,
        tx,
        name,
        args: "List[VariableTracker]",
        kwargs: "Dict[str, VariableTracker]",
    ) -> "VariableTracker":
        if (
            name == "__subclasses__"
            and len(args) == 0
            and not kwargs
            and "__subclasses__" not in self.value.__dict__
        ):
            options = {"mutable_local": MutableLocal()}
            subs_as_vars: List[VariableTracker] = []
            for sub in self.value.__subclasses__():
                source = AttrSource(tx.import_source(sub.__module__), sub.__name__)
                subs_as_vars.append(
                    variables.UserDefinedClassVariable(sub, source=source)
                )

            return variables.ListVariable(subs_as_vars, **options)
        elif (
            self.value in {collections.OrderedDict, collections.defaultdict}
            and name == "fromkeys"
        ):
            from .builtin import BuiltinVariable

            return BuiltinVariable.call_custom_dict_fromkeys(
                tx, self.value, *args, **kwargs
            )
        elif name == "__eq__" and len(args) == 1 and hasattr(args[0], "value"):
            return variables.ConstantVariable(self.value == args[0].value)
        elif name == "__ne__" and len(args) == 1 and hasattr(args[0], "value"):
            return variables.ConstantVariable(self.value != args[0].value)

        return super().call_method(tx, name, args, kwargs)

    def call_function(
        self, tx, args: "List[VariableTracker]", kwargs: "Dict[str, VariableTracker]"
    ) -> "VariableTracker":
        from ..side_effects import SideEffects
        from .builder import SourcelessBuilder, wrap_fx_proxy
        from .builtin import BuiltinVariable

        constant_args = check_constant_args(args, kwargs)

        if self.can_constant_fold_through() and constant_args:
            # constant fold
            return variables.ConstantVariable.create(
                self.as_python_constant()(
                    *[x.as_python_constant() for x in args],
                    **{k: v.as_python_constant() for k, v in kwargs.items()},
                ),
            )
        elif self.value is torch.nn.CrossEntropyLoss:
            return self._call_cross_entropy_loss(tx, args, kwargs)
        elif self.value is contextlib.nullcontext:
            return NullContextVariable()
        elif self.value is collections.OrderedDict:
            return BuiltinVariable.call_custom_dict(
                tx, collections.OrderedDict, *args, **kwargs
            )
        elif (
            self.value is collections.defaultdict
            and len(args) <= 1
            and DefaultDictVariable.is_supported_arg(args[0])
        ):
            return DefaultDictVariable(
                {},
                collections.defaultdict,
                args[0],
                mutable_local=MutableLocal(),
            )
        elif self.value is collections.deque and not kwargs:
            if len(args) == 0:
                items = []
            elif len(args) == 1 and args[0].has_unpack_var_sequence(tx):
                items = args[0].unpack_var_sequence(tx)
            else:
                unimplemented("deque() with more than 1 arg not supported")
            return variables.lists.DequeVariable(items, mutable_local=MutableLocal())
        elif self.value is functools.partial:
            if not args:
                unimplemented("functools.partial malformed")
            # The first arg, a callable (the ctor below will assert on types)
            fn = args[0]
            rest_args = args[1:]
            # guards for the produced FunctoolsPartialVariable are installed in FunctoolsPartialVariable ctor from the
            # args and keywords
            return variables.functions.FunctoolsPartialVariable(
                fn, args=rest_args, keywords=kwargs
            )
        elif self.value is warnings.catch_warnings and not args:
            return variables.CatchWarningsCtxManagerVariable.create(tx, kwargs)
        elif (
            issubclass(type(self.value), type)
            and hasattr(
                self.value, "__enter__"
            )  # TODO(voz): These can invoke user code!
            and hasattr(
                self.value, "__exit__"
            )  # TODO(voz): These can invoke user code!
            and check_constant_args(args, kwargs)
            and self.value.__init__ == object.__init__
            and len(kwargs) == 0  # TODO(ybliang): support kwargs
        ):
            unwrapped_args = [x.as_python_constant() for x in args]
            return GenericContextWrappingVariable(
                unwrapped_args,
                cm_obj=self.value(*unwrapped_args),
            )

        elif is_namedtuple_cls(self.value):
            fields = namedtuple_fields(self.value)
            # check if this a quasi-namedtuple or a real one
            if self.value.__module__ == "torch.return_types":
                # create pseudo-defaults from values of the quasi-namedtuple
                field_defaults = dict(zip(fields, args[0].items))
            else:
                field_defaults = self.value._field_defaults

            items = list(args)
            items.extend([None] * (len(fields) - len(items)))

            var_tracker_kwargs = {}
            for field_name, var_tracker in zip(fields, items):
                if var_tracker is None:
                    if field_name in kwargs:
                        field_var = kwargs[field_name]
                    else:
                        assert field_name in field_defaults
                        field_var = SourcelessBuilder.create(
                            tx, field_defaults[field_name]
                        )
                    var_tracker_kwargs[field_name] = field_var

            for name, value in var_tracker_kwargs.items():
                assert name in fields
                items[fields.index(name)] = value

            assert all(x is not None for x in items)
            return variables.NamedTupleVariable(items, self.value)
        elif (
            self.is_standard_new()
            and SideEffects.cls_supports_mutation_side_effects(self.value)
            and self.source
        ):
            var = tx.output.side_effects.track_object_new(
                self.source,
                self.value,
                variables.UnspecializedNNModuleVariable
                if issubclass(self.value, torch.nn.Module)
                else UserDefinedObjectVariable,
                {},
            )
            with do_not_convert_to_tracable_parameter():
                var.call_method(tx, "__init__", args, kwargs)
                return var
        elif variables.CustomizedDictVariable.is_matching_cls(self.value):
            options = {"mutable_local": MutableLocal()}
            return variables.CustomizedDictVariable.create(
                self.value, args, kwargs, options
            )
        elif (
            variables.RestrictedListSubclassVariable.is_matching_cls(self.value)
            and self.source
        ):
            return variables.RestrictedListSubclassVariable(
                variables.BuiltinVariable(list).call_function(tx, args, kwargs).items,
                user_cls=self.value,
                user_cls_source=self.source,
                mutable_local=MutableLocal(),
            )
        elif self.value in self._in_graph_classes():
            # torch.LongTensor cannot accept a list of FakeTensors.
            # So we stack the list of FakeTensors instead.
            if (
                np
                and self.value in tensortype_to_dtype
                and len(args) == 1
                and isinstance(args[0], variables.ListVariable)
                and len(args[0].items) > 1
                and all(isinstance(x, variables.TensorVariable) for x in args[0].items)
            ):
                # Stack FakeTensor
                stacked = wrap_fx_proxy(
                    tx=tx,
                    proxy=tx.output.create_proxy(
                        "call_function",
                        torch.stack,
                        *proxy_args_kwargs(args, kwargs),
                    ),
                )
                args = [stacked]

            tensor_variable = wrap_fx_proxy(
                tx=tx,
                proxy=tx.output.create_proxy(
                    "call_function",
                    self.value,
                    *proxy_args_kwargs(args, kwargs),
                ),
            )

            return tensor_variable
        elif issubclass(self.value, enum.Enum) and len(args) == 1 and not kwargs:
            options = {"mutable_local": MutableLocal()}
            return variables.EnumVariable.create(self.value, args[0], options)

        return super().call_function(tx, args, kwargs)

    def is_standard_new(self):
        """Check for __new__ being overridden"""
        new_fn = inspect.getattr_static(self.value, "__new__", None)
        if isinstance(new_fn, staticmethod):
            new_fn = new_fn.__func__
        return new_fn in (object.__new__, Generic.__new__)

    def call_hasattr(self, tx, name: str) -> "VariableTracker":
        if self.source:
            source = AttrSource(self.source, name)
            install_guard(source.make_guard(GuardBuilder.HASATTR))
            return variables.ConstantVariable(hasattr(self.value, name))
        return super().call_hasattr(tx, name)

    def const_getattr(self, tx, name):
        if name == "__name__":
            return self.value.__name__
        return super().const_getattr(tx, name)


class NO_SUCH_SUBOBJ:
    pass


class UserDefinedObjectVariable(UserDefinedVariable):
    """
    Mostly objects of defined type.  Catch-all for something where we only know the type.
    """

    _nonvar_fields = {"value", "value_type", *UserDefinedVariable._nonvar_fields}

    def __init__(self, value, value_type=None, **kwargs):
        super().__init__(**kwargs)
        self.value = value
        self.value_type = value_type or type(value)
        assert type(value) is self.value_type

    def __str__(self):
        inner = self.value_type.__name__
        if inner in [
            "builtin_function_or_method",
            "getset_descriptor",
            "method_descriptor",
            "method",
        ]:
            inner = str(getattr(self.value, "__name__", None))
        return f"{self.__class__.__name__}({inner})"

    def python_type(self):
        return self.value_type

    def guard_as_python_constant(self):
        if self.source:
            install_guard(self.source.make_guard(GuardBuilder.ID_MATCH))
            return self.value
        return super().guard_as_python_constant()

    def torch_function_check(self):
        assert has_torch_function(
            self
        ), f"calling torch function on object without __torch_function__ {self}"

    def get_torch_fn(self, tx):
        self.torch_function_check()
        from .torch_function import build_torch_function_fn

        return build_torch_function_fn(tx, self.value, self.source)

    def call_torch_function(self, tx, fn, types, args, kwargs):
        self.torch_function_check()

        from .torch_function import _get_subclass_type_var, call_torch_function

        return call_torch_function(
            tx,
            _get_subclass_type_var(tx, self),
            self.get_torch_fn(tx),
            fn,
            types,
            args,
            kwargs,
        )

    @staticmethod
    @functools.lru_cache(None)
    def _supported_random_functions():
        fns = {
            random.random,
            random.randint,
            random.randrange,
            random.uniform,
        }
        return fns

    def _maybe_get_baseclass_method(self, name):
        if name not in getattr(self.value, "__dict__", {}):
            try:
                return inspect.getattr_static(type(self.value), name)
            except AttributeError:
                pass
        return None

    def call_method(
        self,
        tx,
        name,
        args: "List[VariableTracker]",
        kwargs: "Dict[str, VariableTracker]",
    ) -> "VariableTracker":
        from . import (
            BuiltinVariable,
            ConstantVariable,
            TupleVariable,
            UserMethodVariable,
        )

        method = self._maybe_get_baseclass_method(name)
        if method is not None:
            if method is object.__init__:
                return ConstantVariable.create(None)

            if is_standard_setattr(method):
                return self.method_setattr_standard(tx, *args, **kwargs)

            # [NOTE] OrderedDict, dict subtypes must always have source
            # We cannot instantiate such subtypes in-graph due to builtin __new__
            if method is collections.OrderedDict.keys:
                # subclass of OrderedDict
                assert not (args or kwargs)
                assert self.source  # OrderedDict, dict subtypes must always have source
                keys = list(self.value.keys())
                assert all(map(ConstantVariable.is_literal, keys))
                install_guard(self.source.make_guard(GuardBuilder.DICT_CONST_KEYS))
                tx.output.guard_on_key_order.add(self.source.name())
                return TupleVariable([ConstantVariable.create(k) for k in keys])

            if (
                method in (collections.OrderedDict.__contains__, dict.__contains__)
                and len(args) == 1
                and isinstance(args[0], (ConstantVariable, BuiltinVariable))
                and inspect.getattr_static(type(self.value), "keys")
                in (collections.OrderedDict.keys, dict.keys)
            ):
                assert not kwargs
                assert self.source  # OrderedDict, dict subtypes must always have source

                # TODO(anijain2305) - Why do we need to guard on all keys?
                install_guard(self.source.make_guard(GuardBuilder.DICT_CONST_KEYS))
                return ConstantVariable.create(
                    args[0].as_python_constant() in self.value
                )

            if method is collections.OrderedDict.items and isinstance(
                self.value, collections.OrderedDict
            ):
                assert self.source  # OrderedDict, dict subtypes must always have source
                assert not (args or kwargs)
                items = []
                keys = self.call_method(tx, "keys", [], {})
                for key in keys.unpack_var_sequence(tx):
                    items.append(
                        TupleVariable(
                            [key, self.odict_getitem(tx, key)],
                        )
                    )
                tx.output.guard_on_key_order.add(self.source.name())
                return TupleVariable(items)

            if method is collections.OrderedDict.__getitem__ and len(args) == 1:
                assert not kwargs
                assert self.source  # OrderedDict, dict subtypes must always have source
                return self.odict_getitem(tx, args[0])

            if (
                method in (object.__ne__, object.__eq__)
                and len(args) == 1
                and not kwargs
                and hasattr(args[0], "value")
            ):
                return ConstantVariable(
                    (self.value is args[0].value) is (method is object.__eq__)
                )

            # check for methods implemented in C++
            if isinstance(method, types.FunctionType):
                source = (
                    None
                    if self.source is None
                    else AttrSource(AttrSource(self.source, "__class__"), name)
                )
                # TODO(jansel): add a guard to check for monkey patching?
                from ..mutation_guard import unpatched_nn_module_init

                if method is torch.nn.Module.__init__:
                    method = unpatched_nn_module_init
                return UserMethodVariable(method, self, source=source).call_function(
                    tx, args, kwargs
                )

            if method is list.__len__ and self.source and not (args or kwargs):
                install_guard(self.source.make_guard(GuardBuilder.SEQUENCE_LENGTH))
                return ConstantVariable(len(self.value))

        return super().call_method(tx, name, args, kwargs)

    def method_setattr_standard(self, tx, name, value):
        try:
            name = name.as_python_constant()
        except NotImplementedError:
            unimplemented(f"non-const setattr name: {name}")
        if not tx.output.side_effects.is_attribute_mutation(self):
            unimplemented(f"setattr({self}, {name}, ...)")

        tx.output.side_effects.store_attr(self, name, value)
        return variables.ConstantVariable(None)

    def needs_slow_setattr(self):
        return not is_standard_setattr(
            inspect.getattr_static(self.value, "__setattr__", None)
        )

    def unpack_var_sequence(self, tx):
        if (
            self.source
            and self._maybe_get_baseclass_method("__iter__") is list.__iter__
            and self._maybe_get_baseclass_method("__len__") is list.__len__
            and self._maybe_get_baseclass_method("__getitem__") is list.__getitem__
        ):
            install_guard(self.source.make_guard(GuardBuilder.SEQUENCE_LENGTH))
            return [
                variables.LazyVariableTracker.create(
                    self.value[k],
                    source=GetItemSource(self.source, k),
                )
                for k in range(len(self.value))
            ]
        return super().unpack_var_sequence(tx)

    def next_variable(self, tx):
        return self.call_method(tx, "__next__", [], {})

    def is_supported_random(self):
        try:
            return self.value in self._supported_random_functions()
        except TypeError:
            # TypeError: unhashable type
            return False

    def call_function(
        self, tx, args: "List[VariableTracker]", kwargs: "Dict[str, VariableTracker]"
    ) -> "VariableTracker":
        from .. import trace_rules
        from .builder import VariableBuilder

        if (
            self.is_supported_random()
            and all(k.is_python_constant() for k in args)
            and all(v.is_python_constant() for v in kwargs.values())
        ):
            args = [x.as_python_constant() for x in args]
            kwargs = {k: v.as_python_constant() for k, v in kwargs.items()}
            random_call_index = len(tx.output.random_calls)
            example_value = self.value(*args, **kwargs)
            source = RandomValueSource(random_call_index)
            tx.output.random_calls.append((self.value, args, kwargs))
            # TODO: arguably, this should route to wrap_symint/wrap_symfloat
            # (currently hypothetical), but I'm not going to poke my hand in
            # this nest for now
            return VariableBuilder(tx, source).wrap_unspecialized_primitive(
                example_value
            )
        elif istype(self.value, types.MethodType):
            func = self.value.__func__
            obj = self.value.__self__
            if (
                func is torch.utils._contextlib._DecoratorContextManager.clone
                and variables.TorchCtxManagerClassVariable.is_matching_cls(
                    obj.__class__
                )
                and not (args or kwargs)
            ):
                return variables.TorchCtxManagerClassVariable(
                    obj.__class__
                ).call_function(tx, args, kwargs)

            if (
                func is torch.autograd.grad_mode.inference_mode.clone
                and obj.__class__ is torch.autograd.grad_mode.inference_mode
            ):
                # simulate the inference_mode.clone implementation
                var = variables.ConstantVariable(obj.mode)
                return variables.TorchCtxManagerClassVariable(
                    obj.__class__
                ).call_function(tx, [var], kwargs)

            if self.source is None:
                unimplemented(
                    "Sourceless UserDefinedObjectVariable method not supported"
                )
            func_src = AttrSource(self.source, "__func__")
            func_var = VariableBuilder(tx, func_src)(func)
            obj_src = AttrSource(self.source, "__self__")
            obj_var = VariableBuilder(tx, obj_src)(obj)
            return func_var.call_function(tx, [obj_var] + args, kwargs)
        elif (
            istype(self.value, functools.partial)
            and trace_rules.lookup(self.value.func)
            == variables.TorchInGraphFunctionVariable
            and all(
                variables.ConstantVariable.is_literal(v)
                for v in itertools.chain(self.value.args, self.value.keywords.values())
            )
        ):
            if self.source:
                install_guard(
                    AttrSource(self.source, "func").make_guard(GuardBuilder.ID_MATCH),
                    AttrSource(self.source, "args").make_guard(
                        GuardBuilder.CONSTANT_MATCH
                    ),
                    AttrSource(self.source, "keywords").make_guard(
                        GuardBuilder.CONSTANT_MATCH
                    ),
                )

            partial_args = [
                variables.ConstantVariable.create(v) for v in self.value.args
            ]
            partial_args.extend(args)
            partial_kwargs = {
                k: variables.ConstantVariable.create(v)
                for k, v in self.value.keywords.items()
            }
            partial_kwargs.update(kwargs)
            if is_utils_checkpoint(self.value.func):
                return build_checkpoint_variable().call_function(
                    tx, partial_args, partial_kwargs
                )
            return variables.TorchInGraphFunctionVariable(
                self.value.func
            ).call_function(tx, partial_args, partial_kwargs)
        elif callable(self.value):
            if self.source:
                install_guard(self.source.make_guard(GuardBuilder.FUNCTION_MATCH))
            return self.call_method(tx, "__call__", args, kwargs)

        return super().call_function(tx, args, kwargs)

    def _check_for_getattribute(self):
        if object_has_getattribute(self.value):
            unimplemented("UserDefinedObjectVariable with custom __getattribute__")

    def _check_for_getattr(self):
        return get_custom_getattr(self.value)

    def _getattr_static(self, name):
        if (
            isinstance(self.value, PyTreeSpec)
            or "__slots__" in self.value.__class__.__dict__
            or type(self.value) == threading.local
        ):
            try:
                cls_var = inspect.getattr_static(
                    self.value.__class__, name, NO_SUCH_SUBOBJ
                )
                if cls_var is not NO_SUCH_SUBOBJ and name not in self.value.__dict__:
                    # maybe user-defined @property that we need to inline
                    return cls_var
            except AttributeError:
                pass  # __slots__
            subobj = getattr(self.value, name)
        else:
            subobj = inspect.getattr_static(self.value, name)
        return subobj

    def has_key_in_generic_dict(self, tx, key):
        self._check_for_getattribute()
        if tx.output.side_effects.has_pending_mutation_of_attr(self, key):
            mutated_attr = tx.output.side_effects.load_attr(self, key, deleted_ok=True)
            return not isinstance(mutated_attr, variables.DeletedVariable)

        return key in self.value.__dict__

    def is_supported_nn_module_method(self, method):
        return torch._dynamo.config.inline_inbuilt_nn_modules and method in (
            torch.nn.Module.parameters,
        )

    def var_getattr(self, tx, name):
        from .. import trace_rules
        from . import ConstantVariable

        value = self.value
        source = AttrSource(self.source, name) if self.source else None
        self._check_for_getattribute()

        if tx.output.side_effects.has_pending_mutation_of_attr(self, name):
            return tx.output.side_effects.load_attr(self, name)

        if name == "__dict__":
            options = {"source": source}
            return variables.GetAttrVariable(self, name, **options)

        # TODO(anijain2305) - Investigate if we need specialization for more
        # dunder attrs. inspect.getattr_static does not return correct value for
        # them.
        if name == "__class__":
            options = {"source": source}
            return UserDefinedClassVariable(type(self.value), **options)

        try:
            subobj = self._getattr_static(name)
        except AttributeError:
            subobj = NO_SUCH_SUBOBJ
            getattr_fn = self._check_for_getattr()
            if isinstance(getattr_fn, types.FunctionType):
                # Dynamo is going to trace the __getattr__ function with
                # args=name. Set the source accordingly.
                if getattr_fn is unpatched_nn_module_getattr and isinstance(
                    self, variables.UnspecializedNNModuleVariable
                ):
                    # Manually trace out the nn module __getattr__ to avoid large compilation latency.
                    out = self.manually_trace_nn_module_getattr(tx, name)
                else:
                    new_source = None
                    if self.source:
                        new_source = AttrSource(self.source, "__getattr__")
                    out = variables.UserMethodVariable(
                        getattr_fn, self, source=new_source
                    ).call_function(tx, [ConstantVariable.create(name)], {})

                if self.source and getattr_fn is torch.nn.Module.__getattr__:
                    if isinstance(
                        out,
                        (
                            variables.UnspecializedNNModuleVariable,
                            variables.NNModuleVariable,
                        ),
                    ):
                        # nn_module_stack source is BC surface area. Ensure that
                        # mod._modules["linear"] is reflected as mod.linear for
                        # nn_module_stack.
                        out.set_nn_module_stack_source(
                            AttrSource(self.get_nn_module_stack_source(), name)
                        )
                return out

            elif getattr_fn is not None:
                unimplemented("UserDefined with non-function __getattr__")

        if isinstance(subobj, property):
            if self.source:
                # Read the class attribute to reach the property
                source = AttrSource(AttrSource(self.source, "__class__"), name)
                # Get the getter function
                source = AttrSource(source, "fget")
            return variables.UserMethodVariable(
                subobj.fget, self, source=source
            ).call_function(tx, [], {})
        elif isinstance(subobj, staticmethod):
            func = subobj.__get__(self.value)
            if source is not None:
                return trace_rules.lookup(func).create_with_source(func, source=source)
            else:
                return trace_rules.lookup(func)(func)
        elif isinstance(subobj, classmethod):
            return variables.UserMethodVariable(
                subobj.__func__, self.var_getattr(tx, "__class__"), source=source
            )
        elif inspect.ismethoddescriptor(subobj) and not is_wrapper_or_member_descriptor(
            subobj.__get__
        ):
            # Attribute has a __get__ method. Create a user defined object vt
            # for the subobj, and then trace the __get__ method.
            descriptor_var = UserDefinedObjectVariable(subobj, source=source)

            get_source = self.source
            if self.source:
                get_source = AttrSource(self.source, "__get__")

            # The arguments of the __get__ function are (self, instance, owner)
            # self - descriptor_var
            # instance - instance of the class, represented by self here
            # owner - class object
            owner_var = UserDefinedClassVariable(type(self.value))
            return variables.UserMethodVariable(
                subobj.__get__.__func__, descriptor_var, source=get_source
            ).call_function(tx, [descriptor_var, self, owner_var], {})
        elif isinstance(subobj, types.FunctionType) or (
            isinstance(subobj, types.MethodType)
            and isinstance(self.value, torch.nn.Module)
        ):
            if self.is_supported_nn_module_method(subobj):
                return variables.GetAttrVariable(self, name, source=source)

            # Since we get subobj via self._getattr_static, which may not trigger dynamic lookup.
            # Static lookup can't tell us it's a method or function correctly,
            # so we trigger dynamic lookup here to get the correct type.
            dynamic_subobj = getattr(self.value, name)

            while dynamic_subobj is subobj and hasattr(subobj, "_torchdynamo_inline"):
                subobj = subobj._torchdynamo_inline
                dynamic_subobj = subobj
                source = AttrSource(source, "_torchdynamo_inline") if source else None

            if isinstance(subobj, types.MethodType):
                if dynamic_subobj.__self__ is not self.value:
                    unimplemented("__self__ mismatch for bound method")
                func = subobj.__func__
            else:
                assert isinstance(subobj, types.FunctionType)
                func = subobj

            if inspect.ismethod(dynamic_subobj):
                return variables.UserMethodVariable(func, self, source=source)
            elif inspect.isfunction(dynamic_subobj):
                if is_utils_checkpoint(func):
                    return build_checkpoint_variable(source=source)
                elif source is not None:
                    return trace_rules.lookup(func).create_with_source(
                        func, source=source
                    )
                else:
                    return trace_rules.lookup(func)(func)

        if subobj is not NO_SUCH_SUBOBJ and not is_wrapper_or_member_descriptor(subobj):
            if source:
                return variables.LazyVariableTracker.create(subobj, source)
            else:
                from .builder import SourcelessBuilder

                return SourcelessBuilder.create(tx, subobj)

        options = {"source": source}
        return variables.GetAttrVariable(self, name, **options)

    def call_hasattr(self, tx, name: str) -> "VariableTracker":
        if tx.output.side_effects.is_attribute_mutation(self):
            try:
                result = tx.output.side_effects.load_attr(self, name, deleted_ok=True)
                return variables.ConstantVariable.create(
                    not isinstance(result, variables.DeletedVariable)
                )
            except KeyError:
                pass
        if self.source:
            install_guard(
                AttrSource(self.source, name).make_guard(GuardBuilder.HASATTR)
            )
        if self._check_for_getattribute():
            unimplemented("hasattr with custom __getattribute__")

        try:
            self._getattr_static(name)
            return variables.ConstantVariable.create(True)
        except AttributeError:
            # Now check in __getattr__ function
            getattr_fn = self._check_for_getattr()
            if isinstance(getattr_fn, types.FunctionType):
                # Dynamo is going to trace the __getattr__ function with
                # args=name. Set the source accordingly.
                new_source = None
                if self.source:
                    new_source = AttrSource(self.source, "__getattr__")
                try:
                    result = variables.UserMethodVariable(
                        getattr_fn, self, source=new_source
                    ).call_function(tx, [variables.ConstantVariable.create(name)], {})

                    return variables.ConstantVariable.create(
                        not isinstance(result, variables.DeletedVariable)
                    )
                except ObservedException:
                    return variables.ConstantVariable.create(False)
            elif getattr_fn is None:
                return variables.ConstantVariable.create(False)
            else:
                unimplemented("UserDefined with non-function __getattr__")

    def odict_getitem(self, tx, key):
        from .builder import VariableBuilder
        from .dicts import is_hashable

        # TODO this should probably be merged with the dict handling

        index = (
            key.source
            if is_hashable(key) and key.source is not None
            else key.as_python_constant()
        )

        return VariableBuilder(
            tx,
            ODictGetItemSource(self.source, index),
        )(collections.OrderedDict.__getitem__(self.value, key.as_python_constant()))


class SourcelessGraphModuleVariable(UserDefinedObjectVariable):
    def __init__(
        self,
        value,
        **kwargs,
    ):
        super().__init__(value, **kwargs)

    def call_method(
        self,
        tx,
        name,
        args: "List[VariableTracker]",
        kwargs: "Dict[str, VariableTracker]",
    ) -> "VariableTracker":
        fn_variable = variables.UserFunctionVariable(self.value.forward.__func__)
        args = [self] + args
        return tx.inline_user_function_return(
            fn_variable,
            args,
            kwargs,
        )


class WeakRefVariable(UserDefinedObjectVariable):
    _nonvar_fields = UserDefinedObjectVariable._nonvar_fields

    def __init__(self, value, **kwargs):
        super().__init__(value, **kwargs)

    def call_function(
        self, tx, args: "List[VariableTracker]", kwargs: "Dict[str, VariableTracker]"
    ) -> "VariableTracker":
        call_source = None
        referent = self.value()

        if self.source:
            from .builder import VariableBuilder

            call_source = WeakRefCallSource(self.source)
            return VariableBuilder(tx, call_source)(referent)
        else:
            from .builder import SourcelessBuilder

            return SourcelessBuilder.create(tx, referent)


class KeyedJaggedTensorVariable(UserDefinedObjectVariable):
    @staticmethod
    def is_matching_object(obj):
        mod = sys.modules.get("torchrec.sparse.jagged_tensor")
        return mod is not None and type(obj) is mod.KeyedJaggedTensor

    def __init__(self, value, **kwargs):
        from torchrec.sparse.jagged_tensor import KeyedJaggedTensor

        assert type(value) is KeyedJaggedTensor
        super().__init__(value, **kwargs)

    def var_getattr(self, tx, name):
        if (
            torch._dynamo.config.force_unspec_int_unbacked_size_like_on_torchrec_kjt
            and self.source is not None
            and name in ("_length_per_key", "_offset_per_key")
        ):
            with TracingContext.patch(force_unspec_int_unbacked_size_like=True):
                return super().var_getattr(tx, name)
        return super().var_getattr(tx, name)


class RemovableHandleClass:
    # Dummy class to pass to python_type of RemovableHandleVariable
    # Useful for isinstance check on hooks
    pass


class RemovableHandleVariable(VariableTracker):
    REMOVED = -1

    def __init__(
        self,
        mutable_local=None,
        # index of the registration in the side_effects owned register_hook/handle list, used during removal.
        idx=None,
        **kwargs,
    ):
        super().__init__(**kwargs)
        self.mutable_local = mutable_local
        self.idx = idx

    def call_method(self, tx, method_name, args, kwargs):
        if method_name == "remove":
            if self.idx != self.REMOVED:
                tx.output.side_effects.remove_hook(self.idx)
                self.idx = self.REMOVED
            return variables.ConstantVariable.create(None)
        super().call_method(tx, method_name, args, kwargs)

    def reconstruct(self, codegen):
        if self.idx == self.REMOVED:
            # Hook has already been removed, return a dummy handle
            codegen.add_push_null(
                lambda: codegen.load_import_from(
                    "torch._dynamo.utils", "invalid_removeable_handle"
                )
            )
            codegen.extend_output(create_call_function(0, False))
            return
        # unreachable due to codegen.add_cache() when the hook is installed
        super().reconstruct(codegen)

    def python_type(self):
        return RemovableHandleClass
